Phenothiazine carboxylic acid derivatives



Un sd ew P t Q fi e.

3,375,248 Patented Mar. 26,

ABSTRACT OF THE DISCLOSURE A compound, having'anti-inflammatory and analgesic utility, selected from the class consisting of (a) phenothiazine derivatives of the formula whereX represents an alkanoyl radical and Y represents a group selected from the class consisting of N-methyl piperazino, N-phenyl piperazino and groups of the formula 'AC,,H Am where A represents NI-I or -O, n is an integral number from 2 to and Am represents a group selected from the class consisting of dialkylamino in which each alkyl group contains 1 to 4 carbon atoms, and heterocyclic nitrogen groups, and (b) non toxic acid additionsaltsof said phenoth'iazine' derivatives.

This is a continuation-in-part of applic'ants US. patent application, .S;N. 509,218, filed Nov. 22, 1965, now

abandoned.

This invention relates to phenothiazine carboxylic acid derivatives and to'their production. It is particularly concerned with such compounds having therapeutic utility as hereinafter set forth.

In this invention use is made of phenothiazine carboxylic acid chlorides of the Formula I where X represents an alkanoyl group, e.g. a group selected from the. class consisting of formyl, acetyl and propionyl groups, or an aryl-keto group or an aralkylketo. group. Where X represents an aryl-keto group, said aryl group may be an unsubstituted or a substituted phenyl group such, as a monohalophenyl, .dihalophenyl, or methoxyphenyl, a dimethoxyphenyl or a trimethoxyphenyl group; an example of an aralkyl-keto group is phenylactyl group; X may further represent a n butyryl group, a phenyl-acetyl or a benzoyl group which may have a substituent or substituents selected from the group consisting of chlorine, methyl and methoxy while Am represents a group NH--C,,H Am where n stands for 2, 3 or 4 and a Am is a N-methyl-piperazino, N-phenylpiperazino, N-benzyl-pipe'razino, morpholino or diethylamino group.

Within this class of compounds, the compound wherein X is a propionyl group, and the corresponding 3'-carboxylic acid, i.e. l-propionyl phenothiazine-3carboxylic acid andits chloride, and also the lO-arylketoand 10 aralkylketo phenothiazine-B-carboxylic acids and their chlorides are novel and constitute a feature of the present invention.

According to a further aspect of this feature of the invention there is provided a process for the production of- 10-propi0nyl phenothiazine-3-carboxylic' acid'which cornprises reacting phenothi-azine-3-carboxylic acid with propionic acid chloride or propionic acid anhydride. The reaction may be carried out at a temperature from C; to the temperature of reflux of the acylating agent and in the presence of a catalyst which maybe either an acid for example sulphuric acid, or sodium propionate. It is also possible to carry out the reaction in the presence of a base, for example pyridine and this method is preferred when the acylating agent is propionic acid chloride. The reaction can be carried out in the absence of a solvent but where a base is used it is advantageous to provide that a diluent is present, e.g. benzene.

The lO-propionyl phenothiazine-3-carboxylic acid thus obtained may be converted to the acid chloride by reaction with phosphorus pentachloride in a medium of'carbon tetrachloride at room temperature.

According to a second feature of the invention there are provided compounds of the Formula II e 0 O-Y 1 1 i i A (II) where X has the meaning assigned to it aboveand Y represents a group selected from the class consisting of N-methyl piperazine, N-phenyl piperazine and groups of the formula AC,,H Am where A represents NH- or O, n is an integral number from '2 to 5 and Am represents a group selected from the class consisting ofdialkylamino groups in which each alkyl group contains 1 m4 carbon atoms, and heterocyclic nitrogen groups, which may contain a hetero atom additional to the said nitrogen atom e.g. pyrrolidine,"piperidine, morpholine or piperazine.

According to a further aspect of this feature of the invention a compound of Formula II is obtained by reacting a compound of Formula I with aflcompound of the formuly HY where the symbol Y has the meaning assigned to it above.

In' carrying out the said'reaction, the reaction may be effected, in the presence of a diluent, e.g. an aromatic hydrocarbon or chloroform, and if appropriatein the presence of a base acting as acceptor for hydrochloric acid The reaction mixture may then be extracted with an acid, for example aqueous hydrochloric acid, and treated with ammonia to precipitate the compound of Formula II. In other cases, the reaction mixture may be filtered if the product is insoluble, or if the product is soluble the solvent may be evaporated, after which it is taken up in water, the mixture is rendered alkaline," then the base of Formula II is extracted with a suitable solvent, e.g. chloroform. The solvent is evaporated and the base II recrystallised from a suitable solvent. 9

Furthermore the present invention comprises as useful industrial products particularly as intermediates for the synthesis of basic amides, phenothiazine-Bcarboxylic 3 acids having a group X in the lO-position and corresponding to the general Formula Ill I (III) as well as the corresponding chlorides (Formula I), X having the meaning previously indicated.

According to the present invention the acids (III) can be prepared by treating phenothiazine-3-carboxylic acid with the chloride or the anhydride of the acid XOH. The temperature which may be used is from 80 C. to the reflux temperature of the acylating agent and the reaction may be carried out in the presence of a catalyst which may be an acid, for example sulfuric acid, or a salt of an alkali metal of the acid XOH, for example the sodium salt. It may also be carried out in the presence of a basic diluent, for example pyridine, and, in this case, the presence of a catalyst is no longer necessary.

These operations may be conducted without an intermediate medium but can also be conducted in a diluent,

, for example benzene.

The reaction medium is then treated whilst hot with water 'and a tertiary amine such as pyridine and the mix ture is poured into water. The pyridine salt of the acid can then be filtered off (III), if it is insoluble, then the acid (III) liberated by treating this salt with a solution of hydrochloric acid. It the pyridine salt of the acid (III) is soluble, the medium may be acidified with hydrochloric acid. In certain cases, there is obtained a mixture of the acid (III) and the acid XOH; one can then separate them by recrystallisation but the mixture can also be subjected directly to the action of the chlorinating agent, as is indicated below. There is obtained a mixture of chlorides of the acid (III) and the of the acid X.OH-often more convenient to separate one from the other than the acids themselves.

Also, according to the present invention, the acid chloride (I) may be prepared by treating with a chlorinating agent the corresponding phenothiazine-3-c'arboxylic acid alone or mixed with the acid XOH. The chlorinating agent may be phosphorus pentachloride or thionyl chloride. Preferably, it is carried out in the presence of a diluent such as benzene, chloroform or carbon tetrachlo ride, at a temperature from ambient temperature to reflux temperature.

The acid chloride (1) is filtered if it is insoluble in the medium; if it is soluble, the diluent may be evaporated and the residue recrystallised in a suitable solvent. If there is present a mixture of acid chloride (1) and a compound such 'as-the chloride of the acid XOH or phosphorus oxychloride, this residue may be taken up in a solvent for the chloride of the acid XOH or for phosphorus oxychloride but not for the acid chloride (I).

Mostly petroleum ether or ordinary ether are suitable for this purpose. The acid chloride (1) may then be recrystallised from a suitable solvent.

According to a further feature of the invention there are provided compounds of general Formula IV According to a further aspect of this feature of the invention there is provided a process for the production of a compound of Formula IV which 'Eomprises subjecting a compound of Formula IV in which the 10 hydrogen atom is substituted by an alkanoyl group (i.e. a compound of Formula II) to de-acylation. The de-acylation may be effected for example by treatment with the calculated quantity of an alkali metal carbonate or hydroxide in an alcoholic medium, preferably under reflux conditions. I

The invention further includes the acid addition salts from the basic compounds of Formulae II and III, and inorganic or organic acids which are therapeutically acceptable, i.e. non-toxic. As examples of organic acids, I shall cite maleic, fumaric, benzoic, ascorbic, succin'ic, bis-methylene-salicylic, methane, sulphonic, ethane disulphonic, acetic, propionic, tartaric, salicylic, citric, gluconic, lactic, malic, mandelic, cinnamic, citraconic, aspartic, stearic, palmitic, itaconic, glycolic, p-aminobenzoic, glutamic and benzene-sulphonic acid, and as examples of inorganic acids, I shall mention hydrochloric, hydrobromic, sulphuric, sulphamic, phosphoric and nitric acids.

'For producing such saltsfknown general methods may be employed; for example the basic compound and the acid may be reacted (a) in a water-miscible diluent such as ethanol or acetone, after which the salt is isolated by concentrating or cooling the reaction mixture, or by adding said mixture to a water-immiscible liquid such as ether, ethyl acetate or benzene, or (b) in a Water-immiscible diluent such as ether, chloroform or benzene, after which the salt is separated directly. The salt may also be produced by elfecting a double decomposition between a salt of the basic compound and a salt of the acid.

A particular process from producingmonoand dihydrochlorides from said basic compounds comprises reacting an acid chloride of the Formula I with a diamine or the monohydrochloride of a triamine of the formula HY, in accordance with the same process as above described but without an acceptor for hydrochloric acid. The salt may then be filtered 0E its insoluble, or the soluvent may be evaporated if the salt is soluble. The monoor dihydrochloride may then be recrystallised from a suitable solvent.

The present invention relates particularly to, basic amides corresponding to the general Formula V where X and Y have the same meaning as in the Formula II but where the radicle Am of the group NH'C H Am represents an aryl piperazine group of the type 1 where R R R may be selected from the class consisting of hydrogen, halogens such as fluorine, chlorine or bromine, lower alkyl radicles such as methyl, ethyl, N-propyl, isopropyl, n-butyl, isobutyl or tertiary-butyl residues, lower alkoxy groups such as for example methoxy, ethoxy and isopropyloxy groups, and finally the trifluoromethyl group, as well as the acid addition salts that these basic compounds form with mineral and organic acids.

These compounds are capable of being used for the same purposes as those which have been described above:

According to the invention, the compounds for which X represents an acyl group may be prepared by reacting the acid chloride corresponding to the formula I X (VI) with an (N-aryl piperazine) alkylamine HY, the symbol Y having the meaning indicated above.

The reaction may be conducted in 'a diluent, particularly anaromatic hydrocarbon or chloroform, if neces: sary in the presence of a base as a hydrogen chloride ac ceptor. The mixture is for example stirred for about 15 hours at ambient temperature then for 1 hour under reflux. After this, the diluent is evaporated and the residue taken up with ammonical water in order to precipitate the compound corresponding to the Formula V. The latter is then separated by filtration or'extr'action with'a convenient solvent and recrystallised.

Besides, as regards the compounds (V) for which X represents hydrogen, they may 'be prepared according to two procedures, namely:

Process a.-The compounds corresponding to the Formula V and for which X designates an acyl radicle'may be deacylated in a hydro-alcoholic medium by means of an alkali metal hydroxide in equimolecular amount; this treatment may be carried out at reflux temperature.

Process b.It is applied as well to the preparation of new compounds (V) as to the preparation of the compounds indicated above for which X represents hydrogen, and the group Am of HY is an N-aryl piperazino group.

The process b comprises treating the esters of the phew nothiazine-3-car-boxylic acid with the compound HY, the symbol Y having the meaning indicated above. According to this process, an ester corresponding to the formula (VIa) in which R is a lower alkyl residue having 1 to 4 carbon atoms, is heated with an (N-aryl piperazino) alkylamine in equimolecular quantity or. in excess, in the presence or absence of a catalyst such as alumina or a mineral or organic salt of the compound HY; the reaction may be carried out without solvent, the reactants being melted or in the presence of an inert solvent such as an aromatic hydrocarbon, for example xylene.

According to anotheraspect of the invention, a new process for the preparation ofesters VIa is provided. In this case, a 3-(a-ammonium acetyl)- acyl-phenothiazine corresponding to the formula is a quaternary ammonium group such as for example a pyridinium group Hal is a halogen ion is reacted with an alkali metal alcoholate in excess with respect to the equimolecular quantity, in the corresponding absolute alcohol R'OH, the symbol R having the previously indicated meaning. The alkali al-coholate should be in sufficient quantity to precipitate the halogen ion and moreover to act as catalyst in orderto deacylatethe i;

6 trogen'at 10 'and to cleave the methylene pyridinium group. The total reaction is written: r

The yield of this alcoholysis is generally excellent, of

the order of to Furthermore, the invention comprises a process for the preparation of (N-aryl piperazino) alkylamine corresponding to the formula n, R R R having thesame meaning asindicated abov This process comprises treating, in alcoholic medium, the disalt from a strong mineral or organic acid, and a N,N-di-fl-chloro-ethyl)-amino alkylamine, particularly the dihydrochloride (IX), with the compound (X) Accordingtolthis process, I have prepared,for eXamQ ple, a number of (N-aryl piperazino) alkylamines, some of which are novel. These novel (N-aryl piperazino) a1 kylamines are defined below andform part of the invention.

Equally forming part of the inventionare 3-,N,N-dichloroethyD-amino-l-propylamine dihydrochloride and the production thereof by treating 3-N,N-dietha'nolamino- 1-propylamine dihydrochloride with a chlorinating agent, for example thionyl chloride, at ambient temperature in ;he presence or absence of a diluent, for example chloroorm. The following examples will serve to illustrate the in-' ventron:

EXAMPLE 1.

10-acetyl-phenothiazine-3-carb0xylic acid N-methyl piperazide To a solution of IO-acetyl phenothiazine-3-carboxylic acid chloride (3.03. g.) in benzene is..added a quantity of N-methyl piperazine suflicient to form the amide and to neutralise the hydrochloric acid formed. The mixture is stirred for about 30 minutes to 15 hours, the organic phase is extracted with dilute hydrochloric [acid and the aqueous phase is neutralised with, for example, ammonia or potassium carbonate. The desired compound precipitates out: it can be isolated byextraction with a solvent for, the compound, e.g., benzeneor chloroform, and the 7 solventdistilled off under reduced pressure. The product has M.P. 185 C. after recrystallisation from methyl ethyl ketone. Its hydrochloride melts with decomposition at about 180 C.

EXAMPLES 2-12 The procedure of Example 1 was followed but replacing the N-methyl piperazine by an N,N-dialkylamino alkylene diamine or an N,N-dialkyl-amino alkanol to yield the following products:

To a solution in methanol or ethanol of l-acetylpheno- Ex. Amine M.P., crystallisation solvent Acid addition salt,1M.P., crystallisation so vent 2 N,N-dimethyl ethylene diamine 105-110 C. (tetrachloro- Hydrochloride, M.P. 233 0. (approx.)

ethylene). (ethyl acetate plus ethanol). 3. N,N-diethyl ethylene diamine ..do Hydrochoride, M.P. l92193 C. (lsopropyl alcohol plus ethyl acetate). 4. N,N-dimethyl 1,3-propylene diamine...... 113-115 C. (isopropyl ether). Hydrochloride, M.P. 140-145 C. (acetone). 5 N,N-diethyl 1 ,3-propylene diamine 108112 C. (isopropyl ether)-.- Acid maleate, M.P. 132-135 C. (isopropyl I alcohol plus ethyl acetate). 6 2-dimethylamine ethanol 8890 C. (ethanol) Hydrochloride, M P. l84l86 0. (ethanol plus ethyl acetate). 7 2-diethylamino ethanol 92-04 0. (ethanol) Hydrochloride, M.P. 100-165 C. (lsopropyl alcohol plus ethyl acetate). 8 3-dimethylamino propanol-l 128 C. (ethyl acetate). Hydrochloride, M.P. 182 C. (ethyl acetate plus isoprolpyl alcohol). 9... do Oily product Hydrochlori e, M.P. JO-95 C. 10 2-morpl1olino ethanol 50-55 C Hydrochloride, M.P. 200-205 C. (isopropyl V alcohol plus ethyl acetate). 11 3-morpholino propanol-l 5055 C Hydrochloride, M.P. 188190 C. (approx.) (isopropyl alcohol). 12 3-morpholino-1-aminopropane 158 0. (methyl ethyl ketone).- Hydrochloride, M.P. 208 0. (approx.)

- I (isopropyl alcohol).

EXAMPLE 13 thiazine-3-carboxylic acid N-methyl piperazide is added 1O-propionyl-phen0thiazine-3-carb0xylic acid Method (a).-A mixture of 48.6 g. phenothiazine-3- carboxylic acid, 110 g. propionic anhydride and 0.3 ml. sulphuric acid is heated at 120 C. for an hour. The solution is evaporated under reduced pressure. The residue is taken up in 100 ml. pyridine and 100 ml. water, the mixture is stirred at 85 for 45 minutes, then cooled and acidified with dilute hydrochloric acid. The precipitate is filtered, dried and recrystallised from methyl ethyl ketone. It has M.P. 196 C.

Method (b).-A mixture of 48.6 g. phenothiazine-3- carboxylic acid, 110 g. propionic acid anhydride and 1 g. sodium propionate is heated at 120 C. for 2 hours. The solution is evaporated under reduced pressure and the residue treated as in method (a).

Method (c).--A solution of-48.6 g. phenothiazine-3- carboxylic acid in 486 ml. of benzene and 98 ml. of pyridine is treated, with cooling, with 22.2 g. of propionic acid chloride. The mixture is heated to reflux from 30 minutes, cooled, filtered, washed with water and evaporated under reduced pressure. The residue is recrystallised from methyl ethyl ketone.

EXAMPLE 14 IO-propionylphenothiazirie-3-carboxylic acid chloride A mixture of 31.8 g. of 10-propionylphenoth-iazine-3- carboxylic acid, 160 ml. of carbontetrachloride and 23 g. of phosphorus pentaehloride is strongly stirred at room temperature for 3 hours. The solution is evaporated under reduced pressure to a small volume, the residue is taken up in petroleum ether and crystalline product is filtered off, M.P. 110 C. after recrypstal'lization from ether.

EXAMPLE 15 By proceeding in the same manner as Examples 1-12 an equimolar quantity of sodium or potassium hydroxide and an alkali metal carbonate. The mixture is refluxed for about 10 minutes, the alcohol distilled off under reduced pressure, the residue taken up in wtaer to dissolve the mineral salts therein and the organic product extracted with chloroform and the chloroform driven off under reduced pressure.

The product has M.P. 146l47 C. after recrystallisation from a mixture of ethyl acetate and ether. The hydrochloride has M.P. about 218 C. after recrystallisation from a mixture of isopropyl alcohol and ethanol. It is obtained as yellow crystals.

EXAMPLE l7 IO-acetyl phen0thiazine-3-carboxy lic acid (Z-morpholino) ethylamide To a solution of 10-acetyl-phenothiazine-3-carboxylic acid chloride (3.03 g.) in chloroform is added 2-morph-olinoethylamine in a quantity calculated to form the amide and neutralise the hydrochloric acid formed in the reaction. The mixture is stirred for 30 minutes to about 15 hours, the chloroform exaporated, the residue taken up in dilute hydrochloric acid, the solution extracted with ether and the aqueous phase neutralised with potassium carbonate. The product precipitates and is isolated by extraction with a solvent, e.g. chloroform, the solvent driven off under reduced pressure and the product recrystallised.

EXAMPLES 18-24- By applying the technique of Example 17 but replacing the 2-morpholino-ethylarnine by other amines corresponding compounds are obtained. All the products of Examples 17-24 are described below, together with their salts:

Ex. Amine M.P., Recrystallisation solvent Acid addition salt, M.P., Recrystallisation solvent 17 2-morpholino-etl1ylamine 180 C. (ethanol) Hydrochloride, about 240 0. (ethanol).

01 y 68 C. amorphous- Dihydrochloride, about 214 0. (ethanol). Dihydrochloride, about 240 0. (ethanol).

3-piperidino-proylainineel C. (ethyl acetate)... Hydrochloride, about 176 C,(isopropanol). 3-pyrrohd1no-propylamine-l. 143 C. (ethyl acetate) Hydrochloride, about 194 C.(isopropanol). 22 4-diethylammo butylamine-l..-. 108E110.l 1({ether and methyl Maleate, about 74 C.

e y etone 23 3-N-methyl-piperazino-propanokl Oily... Dihydrocllilorlde, about 208 C. (isopropano 24 3-dlmethyl-amino-2-methyl propanol-l ..d0 Hydrochloride about 186 0. (methyl ethyl lretone and ethanol). I

9 EXAMPLE 25 I IO-acetyl phenotIziazine-3-carboxylic acid N-phenyl piperazide O-OHa v To a solution of lO-acetyl phenothiazine-3-carboxylic acid chloride (3.03 g.) there is added N-phenylpiperazine in the quantity calculated as necessary to form the amide and neutralise the hydrochloric acid formed. The mixture is stirred for about hours, the chloroform evaporated,

EXAMPLES 3944 By applying the same technique as in Example 38 but replacing the morpholinoethyla'rnide with other amides corresponding compounds are obtained. The melting points of all the compounds of Examples 37-44, as well as their salts, are set out in the following table:

M.P. 0., Recrystallisation Acid Addition salt, M.P. 0., recrystallisa- 1 YH Amine solvent tion solvent 37 N -phenyl piperazine. 232 chloroform Hydrochloride 190200 (decomp.). 38.. 2-morpholino-ethylamine...-. 183 methyl ethyl ketone 39.. 3-rnorpholino-propylamine-1. 182 methyl ethyl ketone- Hydrochloride 240 methanol. 40.. 4-morpholino-bntylamine-1- 1567 ethyl acetate. Acid maleate 100 (decomp.). 41.- 2-(N-methyl piperazino)-ethyla 174 methyl ethyl keto Dihydrochloride 242 methanol. 42..-. 3- (N -methyl piperazino)-propylamine-1. 202 chloroform Dihydrochloride 260 ethanol. 43. Z-(N-phenyl piperazino)-ethylamine 228 chloroform Hydrochloride 260 methanol. 44..-; v3-(N-phenyl piperazino)-propylamine-1-..- 194 methyl ethyl ketone Hydrochloride 243.

the residue taken up in dilute hydrochloric acid, the solu- EXAMPLE 45 tion extracted With ether and the aqueous phase neutralised with potassium carbonate. The product precipitates and is isolated by extraction with a solvent, advantageously chloroform, and the solvent then driven off under reduced pressure. The product is recrystallised.

EXAMPLES 26-36 By following the provision of Example but replacing the N-phenyl piperazine with other amines and replacing the 10-acetylphenothiazine-3-ca1 boxylic acid chlo- All the compounds of Examples 2636 are described below together. with their salts. The salts can be obtained from the bases by known methods. The products have (A) IO-butyry[-phenothiazine-3-carb0xylic acid Process a.A mixture of 48.6 g. phenothiazine-3-car- 30 boxylic acid, 200 g. butyric anhydride and 0.3 ml. of

sulfuric acid (or 2 g. of sodium butyrate) is heated at about 120 C. for 2 hours. The solution is evaporated under reduced pressure: the residue is taken up with 100 ml. of pyridine and 25 ml. of water; the mixture is stirred at about 85 C. for minutes, then cooled and acidified with dilute hydrochloric acid. The precipitate is filtered, dried and recrystallised from methyl ethyl ketone. Melting point 180 C.

Process b.-A solution of 48.6 g. of phenothiazine-3- carboxylic acid in 486 ml. of benzene and 98 ml. of pyridine is treated, with cooling, with 25 g. of butyric acid chloride. The mixture is heated under reflux for 30 therapeutic utility. minutes then cooled, filtered, washed with water and Ex. Amine Alkanoyl group M.P., recrystallisation Acid addition salt, M.P., recrystallisation I solvent solvent 25 Nphenylpiperazine Acetyl 237 C. (Dimethyl-formamide) Hydrochloride, 150 C. (decomp), 26-- 2'Nphenylpiperazino-ethylarnine. .do..- 188 C. (Ethanol) Hydrochloride, 255 0. (ethanol). 27... 3-N-phenylpiperazino-propylamine-l. do-.- 196 C. (Dimethyltormamide)- Hydrochloride, 2167 0. (ethanol). 28 4-ruorpholino-butylamine-l --d0. 90 C. (amorphous) Maleate 175 C. (Ethyl acetate and ethanol) 29 3-diethylamino-propylamine-l PropionyL. 104 C. (isopropyl ether). Maleate (very hygroscopic).

3O 2-rnorpholino-ethylamine e do. -60 C. (amorphous). Hydrochloride 228 C. (ethanol).

31... 3-ruorpholino-propylamine-l.-. do;.--. 155 C (ethyl acetate).... Hydrochloride 220 0. (ethanol).

32- 2-N-methylpiperazine-ethylaniine...- ...do -80 O. (amorphous)..- Dihydroehloride, 233 0. (ethanol).

33--. 3-N-methylpiperazine-propylamine-L ...do.. 7075 C. (amorphous)... Dihydrochloride, 220 0. (ethanol).

34 2-N-phenylpiperazino-ethylamine. .---do..-.. --95 C. (amorphous)... Hydrochloride, 228 C. (methanol).

3 N-phenylpiperazino-propylamine -..do 173 C. (ethyl acetate).-. Hydrochloride, 234 0. (ethanol).

-- Acetyl Viscous liquid Hydrochloride, 152 0. (methyl ethyl Z-dimethylamino-propanol-l ketone).

EXAMPLE 37 v Phenothiazine-3-carb0xylic a'cid N-phenyl piperazide 10-acetyl phenothiazine-3-carboxylic acid N-phenyl 6O piperazide (15 g.: 35 millimols), M.P. 237 C., is dissolved in 1600 ml. of methanol. The solution-is heated to reflux and there is added during 10 minutes a solution of 36 millimols of potassium hydroxide in ml.

water. After refluxing for 30 minutes the methanol is 65 evaporated to the point of crystallisation of the residue, the residue is then filtered off and the product recrystallised from chloroform.

ethyl alcohol (95% strength). The solution is heated to 75 evaporated under reduced pressure. The residue is recrystallised from methyl ethyl ketone.

(B) Acid chloride A mixture of 31.3 g. of 10-butyryl-phenothiazine-3- carboxylic acid, 160 ml.of carbon tetrachloride and '23 g. of phosphorus pentachloride is vigorously stirred at room. temperature for an hour and a half; the solution is" evaporated under reduced pressure to small volume and the residue is taken up in petroleum ether. The crystalline product is filteredand recrystallised from isopropyl ether. Melting point 108 C.

EXAMPLE 46 (A) IU-bnzoyl phenothiazine-3-carboxylic acid Process a.-A mixture of 48.6 g. of phenothiazine-3- carboxylic acid, 250 g. of 'benzoyl chloride and 0.3 ml. of sulfuric acid is heated at about 110 C. for 3 hours.

The solution is evaporated under reduced pressure, the residue is taken up with 100 ml. of pyridine and 25 ml. of water and the mixture is stirred at about 85 C. for 30 minutes. It is diluted with water, extracted with ether and filtered; the precipitate is taken up with dilute hydrochloric acid then recrystallised from acetone. Melting point 230 C.

Process b.A solution of 48.6 g. of phenothiazine-l carboxylic acid in 200 ml. of pyridine is treated with 112 g. of benzoyl chloride with cooling. The mixture is heated at about 90 C. for 4 hours then 30 ml. of Water are added and it is kept at 90 C. for 30 minutes. It is diluted with water, extracted with ether and filtered; the precipitate is taken up with aqueous hydrochloric acid then recrystallised from acetone.

(-B) Acid chloride A mixture of 34.7 g. of 10-benzoybphenothiazine-3- carboxylic acid, 70 ml. of carbon tetrachloride and 18 ml. of thionyl chloride is heated under reflux for 1 hour. The acid chloride is cooled and filtered. Melting point 170 C.

The same result is obtained by treat-ing the acid with the theoretical amount of phosphorus pentachloride in carbon tetrachloride for 48 hours at room temperature.

EXAMPLE 47 (A) 10- (4-chl0r0 benzoyl) phenthiazine-3-carboxylic acid This acid is prepared according to method A or B of Example 46 except for the following alteration: the water-pyridine solution is acidified with hydrochloric acid and the mixture of 4-chlorobenzoic acid and -(4-chlorobenzoyl)-phenothiazine-3-carboxylic acid which precipitates is filtered and dried.

The 10-(4-chlorobenzoyl) phenothiazine-3-carboxylic acid may be purified by recrystallization from ethyl acetate. Melting point 2l0220 C.

(B) Acid chloride The 10-(4-chloro-benzoyl)-phenothiazine-3-carboxylic acid or a mixture of this acid with 4-chloro-benzoic acid is treated in carbon tetrachloride under refiux for one hour with thionyl chloride, in an amount corresponding to about twice the theoretical quantity necessary to transform the carboxylic acids into their chlorides. The solution is evaporated under reduced pressure, the residue taken up with petroleum ether and the precipitate recrystallised from carbon tetrachloride. Melting point 178 C.

The same result is attained by treating 10-(4-chlorobenzoyl)-phenothiazine-3-carboxylic acid with phosphorus pentach'loride in the theoretical amount, in carbon tetrachloride, for twenty-four hours, at room temperature. The solvent is evaporated under reduced pressure, the residue taken up with petroleum ether and the precipitate recrystallised 'from carbon tetrachloride.

EXAMPLE 48 104(2,4 dichloro benzoyl) phenothiazine-3-carboxylic acid and its chloride This acid and its corresponding chloride may be prepared according to the method described in Example 47.

The 10-(2,4-dichloro-benzoyl)-phenothiazine 3 carboxylic acid has a melting point of 248 C. after recrystallisation from ethyl acetate. Its chloride has a melting point of 158 C. after recrystallisation from carbon tetrachloride.

10-(3,4,5-trimeth0xy benzoyl) phenothiazine 3 carboxylic acid and its chloride This acid and the corresponding chloride may be prepared according to the methods described in Example 47 12 The 10-(3-4-S-trimethoxy-benzoyl) phenothiazine-3- carboxylic acid has a melting point of 222 C. after recrystallisation from-% ethanol. Its chloride has a melting point of C. after recrystallisation from cyclohexane.

EXAMPLE 50 1 0- (3,4-dimethoxy-benzoyl)-phen0thidzirie-3-carb0xylic acid and its chloride The 10(3,4-dimethoxy-benzoyl) phenothiazine-3-carboxylic acid is prepared according to the methods described in Example 47. Its melting point is 206 C. after recrystallisation from ethyl acetate.

Its chloride may be prepared as described in Example 47. This is separated from the veratric acid chloride by taking up with ether the residue obtained by evaporation of the carbon tetrachloride solution. The veratric acid chloride is soluble under these conditions While the desired acid chloride is only very slightly soluble. The precipitate is recrystallised from benzene. Melting point 177 C.

EXAMPLE 51 10-(4-meth0xy-benzoyl)-p henothiazinc-3-carb0xylic acid and its chloride The 10 (4 methoxy benzoyl) phenothiazine-3-carboxylic acid is prepared according to the methods described in Example 47. Its melting point is 268 C. after recrystallisation from methyl ethyl ketone.

Its chloride may be prepared as described in Example 6. Melting point 178, after recrystallisation from carbon tetrachloride.

EXAMPLE 52 IO-(Z-phenyl-acetyl)-phenothiazine-3-carboxylic acid and its chloride EXAMPLE 5 3 3-(N -methyl piperazino)-propylamide of IO-butyrylphenothiazine-3-carb0xylic acid To a chloroform solution of 33.1 g. of the chloride of lO-butyryl-phenothiazine-3-carboxyl-ic acid is added 3- (N- methyl piperazino)-l-propylamine (or its monohydrochloride) in an amount calculated to form the amide and to neutralize the hydrochloric acid formed. Stirred for about 3 hours, the chloroform evaporated, the residue taken up with a dilute solution of hydrochloric acid, this solution is subjected to extraction with ether and the aqueous phase neutralized with an alkali metal carbonate; the desired compound precipiates; it is isolated by extraction by means of one of its solvents, viz. chloroform, then the solvent distilled oil under reduce-d pressure. The residue is recrystallised.

EXAMPLES 54-6 5 There is used the chloride of a phenothiazine-3-carboxylic acid having in the 10 positions an acyl radical which may be different from the butyryl radical.

Besides, as the case may be the 3-(N-methyl pipera zino)-1-propylamine is replaced by another tertiary amino compound which may be used in the form of a monosalt if it is a triamine.

The reaction of the acid chloride and of the tertiary amino compound may be carried out according to the technics described in Example 53.

The corresponding compounds as well as one of their pared according to the methods described in Example 66; salts are shown in the following Table I. lO-(o-toluyl)-phenothiazine-3-carboxylic acidhas a melt- 1 TABLE I -substituent, M.P. (state, in case of a non- Acid addition salt, M.P., recrystallisation Example X-COOH t-Amine compound, Y-H crystalline compound recryssolvent tallisation solvent 53...-Q...- Butyric acid 3-(N-methyl piperazino) propylamine-L.-. 8090 O. (amorphous) Dihytdrochtlfiriiie, 21 5220 0., ethanolace ate e y 54 Benzoic acid 3-dicthy1amino propylaminejl ..d0 Neutral fumarate, 158 C ethanol 55.-. .do 4-dicthylamino butylamine-l 115 C. (ethyl acetate)... 172-174 O. acetone. 56 kchloro-benzoio 4-(N-methyl piperazino) propylaminc-l--- 1l0120 C. (amorphous) Dihytdrochloride, 225235 ethanol ethyl acl ace e. g 57 Benzoic acid 2-morpholino ethylamine 176 C. (acetone) Hydrochloride,"255260 0., methanol. 58.. do... (N-phenyl piperazino) propylamine-l.-- 194 C. (dimethyl formamide). 59 do 2-(N-henzyl piperaz ino)-ethylamine -40 C. (amorphous) Dlhydrochloride, 218-220" 0., methanol. 60 do 4morpholino butylamine-l 148 C. (ethyl acetate)... Acid fumzrate, 217 0., ethanol. 61 do 2-(N methyl piperazino) ethylami 173C. (ethyl acetate).-. Dihydrochloride 238-242" 0., methanol. 62.. ..do--. 2-(N-phenyl piperazino) ethylamine. 178 0. (methyl ethyl ke he). 63 ..do 3-(N-methyl piperazino) propy1amine...-- 95100 O. (amorphous) Dilggdfochizoigide, 214-218 0., ethanol e y ace a e. 64 .do 4-(N-methyl plperazino) butylamine-1..... 9095 G. (amorphous) Dlhydrochlorlde, 232238 0., methanol. 65 ..do 3-morpholino propylamine-l 8090 C. (amorphous) Hydrochlor de 226228 0., ethanol.

- EXAMPLE 66 ing point of ZOO-202 C. after recrystallisation from a I mixture of carbon tetrachloride and cyclohexane. Its chlo- (A) law-tom)Phenothmzme 3 Carboxyhc and 30 ride melts at 134 C. after having been recrystallised Process a.A mixture of 24.3 g. of phenothiazine-3- f ethen carboxylic acid, 154 g. of p-toluic acid chloride-and 0.2 EXAMPLE 68 ml. of concentrated sulphuric acid is heated to about 110 C. for 3 hours. The solution is evaporated under reduced pressure, the residue is taken up with 45 ml. of pyridine and IO-ml; of Water, and the mixture is stirred at about This acid and the corresponding chloride y be p 1 0- m-toluyl -phenothiazine-3-carboxylic acid mind its chloride 85 C. for 30 minutes. It is diluted with water, filtered pared according to the method described in EXamPIeAGG;

and the precipitate washed with ml. of ether. The 10 (m t01uy1) h p enothlazme-3-carboxylic acid has a meltprecrprtate is taken up 1n 100 ml. of N-hYdl'OChlOIlC acid. 40 ing point of 1734759 0. after recrystallisation from a It is filtered, washed with water and dried to yield a rnixmixt f th 1 th 1 k t ture of p-toluic acid and the desired acid. The latter may gg 3 o ig i ig g gzgiffi g zg fi ig be purified by recrystallisation from methyl ethyl ketone. from b anzene 1 Its melting point is 256 C; t EXAMPLE 69 Process b.A solution of 24.3 g. of phenothiazine-3-- carboxylic acid in '100 ml. of pyridine is treated with 60 10-(3,4-di h .b ,1 g. of p-toluic acid chloride, with cooling. The mixture is acid 3-(N-methyl-piperazino)-pr0pylamid r then heated at about 90 C. for 4-hours,"then'1'5 ml. of water added and it is kept-at about 90 c; for 30 min- To a chloroform on o e of 1 utesf'It is diluted with water, filtered and washed with methoxy-benloyl)-Phen0th1aZ1ne.s eahhoxy'hc 3 ether. The precipitate is taken up with dilute hydrochloric added mole of t -p p r )dq pyl ml acid. The mixture of the desired acid and the p-toluic acid 1 or of Its mone-hydroehlorldee lmxture 1s stored for is filt d washed and dried. V v about 3 hours, then the chloroform evaporated. At this I moment of the operation, according to whetherit is de- (B) Acid ch10 sired to obtain the basic product or its hydrochloride, the The 10-(p-toluyl-)-phenothiazine-S-carboxylic acid or a following Procedure is follow mixture of this acid with p-toluic-acid is treatedin carbon In the first case the residue is taken P With Water tetrachloride under reflux, for 3 hours, with thionyl chlothe desired Product Precipitated With an akali m tal arride in an amount corresponding to. approximately twice I bonate- This Product is extracted y means of One f its the theoretical quantity necessary to convert the carboxylic solvents, to wit er then'the nt is distill d acids into their chloridesQThe solution i'sevaporated under under reduced pressure. The residue is recrystallised fromv reduced pressure, the residue taken up with petroleum ethyl acetate 1 ether and the precipitate recrystallised from chloroform. In the second e the residue is directly ry i Its melting point is 135 C. i 5 f om amethanol-ethanol mixturej The same result is obtained by treating 10-(p-toluyl)- phenothiazine-3-carboxylic acid, alone or in the presence EXAMPLES :78 of P acid W h the theorqieal quantity of p The chloride of a phenothiazine carboxylic acid having phorus pentachlorrde in carbon tetrachloride for 48 hours i h 10 an acyl radical which. may difierent at room temperature. The solvent 1s evaporated under ref the g,4 dimethoxy benzoyl radical is used 7 duced pressure, the residue 1s= washedw1th petroleum ether Besides 3 (N- th 1. i i 1 f 1 is a reerystalhsed from chleroform- 7 placed as the case may be by another tertiary-amine com- EXAMPLE 67 Pound which may be used in the form of a monosa-lt in s the case of a triamine. 4 gzigjgg and l The reaction'of the acid chloride and the tertiary amine compound may be conducted according to the technics This acid and the corresponding chloride may be pre- '75-described in Example 69.

The corresponding compounds and one of their salts are listed in the following table:

TABLE II Acid X-OH from M.P. (state, in case of a non- Acid addition salt, M.P., solvent for Ex. which-substitu- YH Tertiary'amino compound crystalline compound), solrecrystallisation cut derived vent for recrystallisation 69 3,4-dimethoxy (N-methyl-piperazino)-3 propylamine-l 162 0. (ethyl acetate) Dihydrochloride; 206-210 0. -methanolbenzoic acid. ethanol.

70 Phenylacetic acid .do 80-00 C. (amorphous) Dihydrochloride, 222-225 0., methanol- 7 ethanol.

71 ltgitlglgrlo beudo s 90100 C. (amorphous) D'ihydroohloride, 230250 0., methaaol.

72 3,4,5, trimethoxy do 80-90 C. (amorphous) Dihydrochloride, 215-230 0., ethanol.

benzoic acid.

73 illlhOXY beuzoic ....do do Dihydrochloride, 200-220 0., ethanol.

74 p-Toliiic acid do do Dihydrochloridc, ace-215 o; ethanol.

75 do Z-(N-mcthyl-piperazino) ethylamine 160-162 0. (ethyl acetate). Dihydrocliloride 23o-%5 0.105% ethanol.

76 o-Toluic acid. 3-(Nmethyl-pi perazi no) propylarnin 80-90 C. (amorphous) Diliydi'o'chloride, 235-250 0., 05% ethanol.

77 do 2-(Nmethyl-piperazino) ethylamine l05110 0. (amorphous) Dihydrochloride, 260-270 0., 90% ethanol.

78 m-Toluic acid do 172-174 C. (ethyl acetate)-.." Dihydrochloride, 220-235 0., 90% ethanol.

EXAMPLE 79 3 :(N- (4-chl0r0-phenyl) piperazino) -pr0pylamide 0f 10- acetyl phenothiazine 3-carb0xylic acid The chloride of a phenothiazine-3-carboxylic acid having at the 10-position an acyl radical which may be different from the acetyl radical is used. The 3-(N-(4-chlorophenyl) piperazino)-propylamine-l is replaced as the case may be by another amine compound HY.

The reaction of the acid chloride and of the compound HY may be carried out according to the technics described for Example 79.

The corresponding compounds thus prepared are shown in the following Table H.

TABLE 11 (continued) Number of Acid XOH from which the EXAMPLE 100 Process a.-To a mixture of 0.1 mole of 3-(N-(4- chloro-phenyl) piperazino) propylamide of IO-acetylphenothiazone-3-carboxylicacid and 500 ml. of methanol there is added, in 10 minutes with stirring and at reflux temperature, 0.1 mole of potassium hydroxide in 0.5 N aqueous solution. The reflux is maintained for 30 minutes more and the product is filtered after cooling. It is recrystallised from a mixture of dimethyl formamide and methyl ethyl ketone.

The same result is obtained by replacing the indicated amide by 3 (N (4-chloro-phenol)-piperazine)-propylamide of 10-propionyl-phenothiazine-3-carboxylic acid.

Process b.There is kept under reflux for 20 hours, under a current of nitrogen and with stirring, a mixture of 0.1 mole of methylester of phenothiazine-3-carboxylic acid, 25.3 g. (0.1 mole) of 3-(N-(4-chlor0-phenol)- piperazine)-1-propylamine and 25 ml. of pure xylene. The reflux is maintained for 20 hours and the methanol formed in the course of the reaction is collected. The mixture is then cooled and diluted by about 25 ml. of methyl ethyl ketone and then the crystalline product is filtered and recrystallised as in the procedure a.

The same result is obtained in replacing the methylester of phenothiaZine-3-carb0xylic acid with the, ethyl,

Melting point, recrystallisation solvent Example lo-substituent is derived Tertiary amino-compound HY (Code) 79 (3100) Acetic acid 3-[N-(4-ohloro-phenyl) piperazino1-1-propylamine- 159 0., Me-Et-Ketone.

80 (3104) Propionic acid .do 168 0., Me-Et-Ketone.

82 (3103) Propionic acido 138039 0., ethyl-acetate.

83 (3105) Acetic ac 3-[N-(Z-chloro-phenyl)piperazino]-1-propylamine 130 0., crystallises in ether.

84 (3113) Propionic acid" .d0 143-144 0., ethyl acetate.

85 (3038)- Benzoic acid 3-[N-(3-chloro-phenyl)piperazinol-l-propylamine. 194 0., ethyl acetate-D.M.F.

86 (3165) Acetic acid. 4(N-phenyl piperazino)-l-butylamine 132 0., ethyl acetate.

87 (3110). ..do 3-[N-(4 Inethyl-phenyl)piperazinol-l-propyl- 155 0., ethyl acetate.

amine.

88 (3114). Propionie acid do 169 0., ethyl acetate.

89 (3031)-.. Acetic acid 3-[N-(2-methyl-phenyl)piperazino]-1-propyl-. 150 0., ethyl acetate.

amine.

90 (3115) Propionic acid do 143 0., ethyl acetate.

91 (3008) Acetic acid 3[N-(B-methyl-phenyl)piperazinol-Lpropyl- 188 0., Me-Et-Ketonc.

' amine.

92 (3034) Propionic acid do 0., ethyl acetate.

93 (3028)-.." Acetic acid 3-[N- -methoxy-phenyl)piperazinol-l-propyl- 1 132 0., ethyl acetate.

amine.

94 (3116) Propionic acid do 163 0., acetone.

95 (3039)- Acetic acid. 2-[N(4-rnethoxy-pheriyl)piperazino]ethylamine- 153 0., ethyl acetate.

96 (3117) o 3-[N-(2-methoxy-phenyl)piperazino]-1-propy1- 142 0., ethyl acetate.

am no.

97 (3030) do 3-[N-(3-methoxy-phenyl)piperazino1-1-propyl- 143 0.,-ethyl acetate. amine 93 (3033) Propionic acid do 148 0., ethyl acetate.

amine.

09 (3036) Acetic acid 3-[N-(3-tritluoromethyl-phenyl)-piperazino]-1- 0., ethyl acetate.

propylamine.

propyl', or butyl ester of the same acidjfor these latter esters, the duration of reflux should be between 20 and 100 hours. EXAMPLES 101-111 The compounds defined below are prepared according to one. or other of procedures a and b illustrated by the Example 100.

According to procedure a, the acyl group at the 10- position of the .acetylated derivatives or the corresponding propionyl derivatives-is selectively hydrolysed.

According to procedure b, an (N-aryl piperazino) alkylamine which may be different from 3 -(N-(4-chlorophenol)-piperazino)-propylamine is reacted with an alkyl ester of.phenothiazine-3-carboxylic .acid. The correspond.-

ing compounds are shown in the following Table III.'

TABLE III Number Melting point solvent ot(exa1m)ple Tertlary amino-compound for recrystallisation 100 (3102) 3-[N-(4-chloro-pheny1)pipera- 230 0., Me-Et-ketonez1no]-propylamine-1. D.M.F.

101 (3l11)- 3-[N-(2-chloro-pheny1)plpera- 206 0., Chloroformzmo]-propylamine-1. D

102 (3101)..- 3-[N-(3-ehloro-phenyl)plpera- 217 0., Me-Et-ketonezmel-propylamine-l. D.M.F.

103 (3112) 3-lN-(4-1nethy1-phenyl)pipera- 212 0., Me-Et-ketone.

zino]-propylamine-1.

104 (3009) 3-[N-(2-methyl-phenyl)pipera- 226 0., Me-Et-ketone- 105 (3010)-.- 3-[N-(8-methy1-pheny1)pipera- 193 0., Me-Et-ketone.

. zmo -propylamine-1.

106 (3029). K-[N-(4-methoxy-phenyl)plperazm -propy1amine-1.

107 (3040)- 2-[N-(4-mlethoxy-phenyl)pipera- 2111 et ylamme.

108 (3118). 3-[N-(2-methoxy-phenyl) pip erazino]-propylaminel.

109 (3035)..- 3-[N-(3-methoxy-phenyl)plperazino]-propy1amine-1.

110 (3037)..- 3-[N-(3-trifiuoro-phenyl)piperazino]-propylamine:l.

111 (3166)... 4-(N-phfnyl-piperazino)-hutylamme- 200 0., Me-Et-ketOne.

207 0., Me-Et-ketone- 173"'o.', chloroform.

172 0., Me-Et-ketone.

202 0., Ma-Et-ketone.

EXAMPLE 112 Process b of Example 100 is also applicable to the preparation of compounds previously described such as 3-carboxylic acid and the 2-(N-phenyl piperazino)ethylamide of the same acid. The 3-(N-(4-chloro-phenyl)- piperazino)-propylamine-1 (0.1 mole) is then replaced respectively by 3-(N-phenyl piperazino)-propylamine-1 (0.1 mole) or 2- (N-phenyl piperazino)-'ethylamine' (0.1 mole).

EXAMPLE 113 phenothiazine'and 1001111701 anhydrouspy'ridine is heated" to about 50 C. for about 20 minutes then at about 85 C. for 30 minutes. The excess of pyridine is evaporated ofl 18 added also at room temperature and then the mixture slowly brought to reflux temperature and reflux maintained for 1 hour. There may also be added a methanol solution of the quaternary ammonium derivative to the sodium methylate solution at a temperature between the reflux temperature and room temperature. After 1% hours of reflux, there is slowly added 3.8 g. of glacial acetic acid, and about 225 ml. of methanol are distilled off. The mixture is cooled, the methyl ester mixed with sodium chloride is filtered off, theproduct washed with water and dried. The ester may be recrystallised from methyl ethyl ketone. The yield is 85-90%.

' EXAMPLES 114-116 'Ethyl, 'propyl or'butyl esters 'bf'pheiz'othz'zizin 3l ..ycarboxylic acid The same procedure as for Example -1-13-'is"followed.

190 0.;Ethyl acetater' The volumes of anhydrous methanol mentioned are merely replaced by the same volumes of anhydrous alcohol (ethanol, propanol or butanol) corresponding to the desired ester.

EXAMPLE 117 3-(Nsphenyl piperazino) propylamine-I To a solution of l mole of 3-N,N-di( 8-chlorethyl) m nop opy m d yd' c r'i and .1. m le of pressure and the residueis rectified under a good vacuum.

Following the same proceure but replacing aniline as the case may be by anilines having substituents on the phenyl nucleus, and the dihydrochloride of 3-N,N-di(13- 3-(N-phenyl'-piperazino)-propylamide of phenothiazine=- -'---chloro-- ethyl)- amino 1 propylamine-l by the dihydro= chloride of 4-N,N-di(,3-chlorethyl) amino-butylamine-l or that of 2-N,N-di(fl-chlorethyl) amino-ethylamine, there are prepared (a) Known (N-aryl piperazino) alkanol amines such as the 4-(N-phenyl piperazino -butyla mine-1 3- (N- (2-chlorophenyl) -piperazino -propyl-amine-1 3 -(N-(4-chlorophenyl)-piperazino) propylamine-1 3- (N- 4-methylphenyl) -pip erazino) propylamine-l 3-.(N=.(4-methoxyphenyl-piperazino).-propylamine-1- Z-(N-phenyl piperazino) -ethylamine (b) New (N-aryl) piperazino) alkylamines identified in under reduced pressure. The 3-(acetyl pyridinium)-10- the following Table IV.

. TABLE v (N-aryl piperazino) alkylamine Yield, Boiling point 25 percent I 3-[N-(3-chl0ro-phenyl) piperazinoI- 67 150165 0. (0.04 mm.) 1.573

pro ylamine-l. L m. m -3-[N-g-methy1-phenyl)piper-azure]-- 62 -127-133*0.-(0;05m1n.)::"1:-547

ropylamine 1 3- N-3-methyl-phenyi) piperazino]- propylamine-l.

3-[N-(2-methoxy-phenyl) piperazinolpro ylamme- 3-[N-g3-methox317-phenyl) piperazino} romethyl-phenyl) piperazino} ropylamine-l.

2-B I-(4methoxy-phenyl) piperazino} ethylamina.

propionyl-phenothiazine chloride is taken up in 250 ml. The dihydrochloride of 3-N,N-di (fi-chlorethyl) aminoof anhydrous methanol and the solution brought to reflux. There is then added during 10 minutes, maintaining reflux under an inert atmosphere, a solution of sodium methylate prepared from 200 ml. of anhydrous methanol and 10 g.

propylamine-l which serves as. starting material may be prepared in the following manner.

To 950 ml. of thionyl chloridethere is added slowly and with stirring 235 g. of 3-N,N-di (fl-hydroxyethyl) of SOdiUIIl-"'Th6 solution-of sodium methylate-maybe amino-propylamine 'l'dihydrochloride.

19 20 The mixture is stirred for 20 hours at room temperature. methylpiperazino)-1-propylarnine (or its monohydrochlo- The excess of thionyl chloride is evaporated under reride) in an amount calculated to form the amide and to ducedpressure at a temperature below 40 C. The residue neutralise the hydrochloric acid formed. The mixture is is taken up, with cooling, in 250 ml. of methanol. The stirred for about 3 hours, the chloroform is evaporated,

crystalline product is filtered. The yield is 92%, the melt- 5 the residue taken up in dilute aqueous hydrochloric acid,

ing point 154 C. The pure product has a melting point the solution is subjected to extraction with ether and the of 159 C. after recrystallisation from methanol. aqueous phase neutralised with an alkali carbonate, 'which causes the desired compound to be precipitated. It is iso- EXAMPLE 118 lated by extraction by means of one of its solvents, to wit 10 chloroform, then the solvent is removed by distillation under reduced pressure. The residue is recrystallised.

Preparation of 3(N-methyl-piperazino)-pr0pylamide of 10-butyryl-phen0thiazine-3-carboxylic acid To a chloroform solution of 33.1 g. of IO-butyryl- In the Table V below there are listed the principal charphenothiazine-3-carboxylic acid chloride is added 3-(N- acteristics of the basic compounds and salts thereof:

' 7 TABLE V Order No. M.P. (state, in the case of 3. Acid addition salt, M.P., solvent, (Code No.) Formula noncrystalline compound) for crystallisation solvent for crystallisation E N S 119 (3131)-.-" 80790" 0. (amorphous) Dihydrochloiide, 215-220? 0., ethan- III nollethyl acetate. o o-nrucrn-om-om /S\ H502 C2115 120 (3142) \N/ I 8090 0. (amorphous) Neutral iumarate, 158 0., ethanol.

i I 7 N -C O-NH-CH2-CHr-CH1 S H602 C2H5 I 121 (3143) \N/ 115 0. (ethylacetate) Hydrochloride, 172-174 0., acetone.

, \C/ C O-NHCH:CH:CH2CH2 I r N /s j 122 (3133) k N 110-120 0. (amorphous) bllggdlrochlzoigide, 225-235" 0.,ethanoll e y ace a e. l N 0 O-NHCH2-CH:CHa

. l l 123 (3135) N C0-NH-0H;-OH 1 176 0. (acetone) Hydrochloride; 255-260" 0.; methanol.

. V N s r 124 a14o \N r I 194 o. (dimethyliorrnamide) 4 \N/ CONH0H:CH:CH:

TABLE VContinued Order No. M.P. (state, in the case of a Acid additlon salt, M.P., solvent (Code No.) Formula nnonerystalllne compound) for crystallisation solvent for crystallisation a 0 1316134)... N 80-90 C. (amorphous) Hydrochloride, 226-228 0., ethanol.

1 C O-NHC Hr-C Hs-C H: N

e o 132 (8146)..--- w H H v r 162 0., ethyl-acatalben;. .:...-a Dlhydrochlorlde, 206-210 C-yfllflthB l III nolethanol. N C O-NH-CHr-CHr-C H:

c o-Q-o CH:

l OCH;

Bil -90 C. (amorphous) Dihydrochlorlde, 222-225 0., methanolethanol.

90-100 G. (amorphous) Dlhxydroohlorlde, 230250 0., methano OCH:

80-90 C. (amorphous) Dlhydrochlorlde, 215-230 0., ethanol.

80-90 C. (amorphous) Dlhydrochlorlde, 200-220 0., ethanol.

' TABLE V-'Con tinued Order No. in M.P. (state,v inthe case oi 8 Acid addition salt, M,Pi, solvent- (Code N 0.) Formula noncrystalline compound) for crystallisation solvent for crystallisation i N /S\ va H 137 (3161)- N 80-90 C. (amorphous)... Dihydrochloride, 200215 6., ethanol.

I N C O-NH-CHr-CHs-CH:

c o-Q-c H: l

(EH: I I N 138 (3162).". 160-162 C. (ethyl acetate). Dihydroohloxide, 230245 0., 95% 1 1|? ethanol.

' 995 TQE a v N o I 140 (3164)..." 105110 C.(amorphou s) Dihglldroclhlorlde, 260-279 C 99% :1 H

i f": f 6 V COr-NH-GI-Ig-egH: I v

The above compounds may used fof'therapeutic' The following table shows the toxicity and antipurposes or as intermediates in the synthesis of other inflammatory activity compared with phenylbutazone for 75 the compounds of Examples 25 to 44.

compounds.

LDMI, mouse Anti-inflammatory activity Example No. New Substance Phenylbuta- (code number) zone, 150 mg./

Route Dose, mg./ Dose, mg./kg., Percentage 1511., percentage kg. i.p. diminution minution oi oi oedema, oedema,perceut percent i.p. 2,000 300 14. 7 7 i.p. 266 100 29 15 i.p. 276 150 50 19 LV. 150 100 33 26 LV. 35 25 11. 11 i.v. 150 100 38 8 LV. 96 75 37 17 i.v. 75 25 13 LV. 132 100 63 18.5 i.p. 133. 4 5o 16. e 14 i.p. 327 150 64 i.v. 46 25 21 17 I 1.p. 2, 500 800 21 14. 5 iv. 163 140 43 2. 8 i.v. 125 100 17 i.V. 187 150 65 25 i.v. 125 50 40 11 i.v. 160 100 59 26 i.p. 1, 000 300 31 18 i.p. 1, 200 300 54 26 There have been measured, for the compounds shown in a previous table, the acute toxicity, expressed by the 50 percent lethal dose (LD the anti-inflammatory activity and the analgesic activity. In these measurements the acute toxicity was measured in the mouse (intravenous administration) according to the method of Karber and Behrens, and the anti-inflammatory activity according to the inhibition of generalised oedema caused by the injection of ovalbum-in in the rat, phenylbutazone being used It will be recalledthat; according .to this test, the lower the percentage of analgesia, the greater the analgesic power of the compound;

For use in therapeutics the compounds may be in the form of salts .which they form withpharmaoeutically acceptable acids, and they may be provided for administration as tablets, suppositories or for parenteral administration. 1

The following examples illustrate administerable as the reference substance. 35 forms:

The analgesic activity was measured according to the 1 painful abdominal cramp test caused by phenyl benzo- Exampl A quinone in the mouse as described in 11 Farmaco ed. I Prat. 1961, 16, 232-239; the results are listed in Table I VI which foll w Compound 3120 (Example 40) 0.04 TABLE VI Starch .Magnesiumstearate 0.0025

Analgesla Dose used (percentage of animals MgJkg. Route not protected) Example B (suppository) 10o i.p. 40 t 130 i. 29 1 1 G 60 Lp. 17 1 5o i.v. 37.5 Compound 3120 (Example 40) 0.05 Q 33' Polyethylene glycol (Carbow-ax 4000) q.s.p. 2 5o i.v. 47.5 28 i i l l 1.v. y 60 m 22 Example C (myectab e.s0 utmn) 50 i.p. 10 t 150 i.p. 29

s0 i.v. a2 Compound 3120 (Example 40) g 0.10 38 11;: 3?, Distilled water q.s.p ml- 2 i v 40 so i 40 2g $2 The following table shows the results obtained with the compounds of Examples 69 to 78':-

Number Anti-inflammatory activity I Analgesic activity LDtu, Percent Phenylbu- Codev 1 Example. mgJkg. .Do se, i.p., diminution tazone at 150 Dose, mg./kg..c Analgesia,

mgJkg. of oedema mg./kg., i.p., percent percent 69 50 as 6.3 so 25 70 50 46 6.3 so 25 71 50 39. s 6.3 22. s 72 15 11.3 6.3 15 70 73 50 37.5 8.8 5o 55 74 25 22 as 70 10 75 100 61 10 7.5 76 so 42 9.6 v70 ,,5 77 so a0 9.6 so 7.5 7s 80 43-; 1 27. I 17.6

29 The following table shows the toxicities, and the'antiinflammatory and analgesic activities of the compounds of Examples 119 to 141:

wherein D is Cl, CH OCH or CR, or (b a non toxic acid addition salt thereof.

2. A compound according to claim 1 wherein X is H.

1 Anti-inflammatory activity Analgesic activity Example N o. Toxicity, LD

(Code N o.) in mgJkg. Percent of Phenyl- 7 Dose, i.p. reduction butazone at Dose, Analgesia, in mgJkg. of oedema 150 mg./kg., mgJkg. percent i.p., percent 119 (3131) 133 l.v 100 51 15 (3 72 i.p 3O 40 30 22 i. 10 13 13 75 42 14 250 v 58 29 800 28 13 200 26 26 150 41 13 100 47 15 300 8 13 50 31 15 30 31 13 150 40 13 It will be reminded that the figures for analgesia represent the percentage of unprotected animals; consequently the lower the figure, the higher the-analyesic activity of the corresponding compound.

The compounds of Examples 119 to 141 may be used as anti-inflammatory, analgesic or anti-pyretic agents in the form of salts which they form with pharmaceutically accepetable acids. Administerable forms which may be used are tablets, suppositories and injectable liquids.

The following examples illustrate administerable forms:

Example 1) (tabl etl G Compound 3132 0.04 40 Starch 0.0575 Magnesium stearate 0.0025

) Example E (suppository) G. Compound 3132 0.05 Polyethylene glycol (Carbowax 4000) q.s.p. Y 2 ExampleF (injectable solution) l Compound 3132 g 0.10 Distilled water, q.s.p ..'ml 2 In the preceding examples, the active substance is the compound No. 3132 that is to say B-(N methyI- iperazino)-propylamide of 10-benzoyl-phenothia2ine-3-carboxylic acid. I

WhatIclaimis: a a H '1. A compound having the formula '(a)' H oo-Ao.H2..Am

wherein X is H, COCH COCH CH V (V)m wherein V is C1, CH or OCI-I and m is 1-3, A is 0 or NH, n is 2, 3 or 4, Am is r\ N N N N CH3 L D N N or N/ v \N COCH 3.

3. A compound according to claim 1 wherein X is 4. A compound-according 'toclaim 1 wherein COCH C-H I 5. A compound according to claim L wherein X 6. A compound according to claim 1 wherein X 12.; A compound according to claim! wherein Am is 13. A compound according to claim l -wheiein Am is 14. A compound according to claim 1 wherein Amis 15. A compound according to claim 1 where in Am is I p. N N- 16. A compound according to claim 1 wherein is and D is Cl, CH OCH or CF '31 17. A compound according to'claim 1' having-the formula or a non-toxic acid addition salt thereof.

18. A compound according to claim 1 having the formula COCHJ or a non-toxic acid addition salt thereof.

19. A compound according to claim 1 having the formula or a non-toxic acid addition salt thereof.

21. A compound according to claim 1 having the formula or a non-toxic acid addition salt thereof.

22. A compound according to claim 1 having the formula or a non-toxic addition salt thereof.

23. A compound vaccording to claim 1 having the formula or a non-toxic acid addition salt thereof.

24. A compound" according to claim 1 having the formula ooornon,

or a non-toxic acid addition salt thereof.

25.-A compound according to claim 1 having the formula I COOHnCHn or a non-toxic acid addition salt thereof.

26. A compound according to claim.1 having the formula or a non-toxic acid addition salt thereof.

27. A compound according to claim 1 having the formula or a non-toxic acid addition salt thereof.

28. A compound according to claim 1 having the formula or a non-toxic acid addition salt thereof.

29. A compound according to claim 1 having the formula COCH;

or a non-toxic acid addition salt thereof.

30. A compound according to claim 1 having the formula or a non-toxic acid addition salt thereof.

31. A compound according to claim 1 having the formula COCl-Ia or a non-toxic acid addition salt thereof.

32. A compound formula or a non-toxic acid addition salt thereof.

according to claim 1 having the 33 33. A compound according to claim 1 having the formula or a non-toxic acid addition salt thereof.

34. A compound according to claim 1 having the formula or a non-toxic acid addition salt thereof.

35. A compound according to claim 1 having the formula CONHCsHo-N N-OHs N U I 0 H or a non-toxic acid addition salt thereof.

36. A compound according to claim 1 having the formula or a non-toxic acid addition salt thereof.

37. A compound according to claim 1 having the formula or a non-toxic acid addition salt thereof.

H. I. MOATZ, Assistant Examiner. 

